Blue Sky,
You do know your lotus position. My husband is Indian. He would know. Actually you just proved my point. You said they sit in "half-lotus" posture. They're halfway there already. 
I'm just stressing again, that one shouldn't get all wrapped up (GET IT? WRAPPED UP?? HA! HA!, I made a funny) in sitting the "right" way to get enlightened. It's your mind that frees you.
Blessings,
Diana
